Code:
using System;
using System.Collections.Generic;
using System.Text;
using System.Text.RegularExpressions;
namespace ConsoleApp10
{
    class Program
    {

        static void Main(string[] args)
        {
            int year = 0;
            int month = 0;
            DateTime targetMonth = DateTime.Now;
            int[,] calendar = new int[6, 7];
...